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Special Forums IP Networking DNS SOA Question in regards to @ Post 302925686 by Lost in Cyberia on Tuesday 18th of November 2014 02:08:13 PM
Old 11-18-2014
DNS SOA Question in regards to @

Okay, I have a question guys... I was given a task to set up a DNS slave server, in addition to our already set up BIND DNS master server. I looked over the one of the zone files, and found something curious. The starting SOA line, reads as:

@ IN SOA @ root ( ...etc...etc..)

I'm a bit confused as to the meaning of the @ symbols. The first @ symbol can replace the $origin term I know, but there is no $origin variable declared in the file The only thing that comes before the SOA is the TTL.

So I"m baffled as to what the @ could possibly do or if it can substituted for anything else, without explicitly saying it. Because I see no declarations in the zone file.

Any help would be appreciated! Thanks!
 

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avahi-dnsconfd.action(8)				      System Manager's Manual					  avahi-dnsconfd.action(8)

NAME
avahi-dnsconfd.action - avahi-dnsconfd action script SYNOPSIS
/etc/avahi/avahi-dnsconfd.action DESCRIPTION
avahi-dnsconfd.action is the action script that is called whenever a new unicast DNS server is found or removed by avahi-dnsconfd. The default script as shipped with avahi patches /etc/resolv.conf to reflect the changed unicast DNS server configuration. PARAMETERS
argv[1] Contains the character "+" if the DNS server is new, "-" when it shall be removed from the DNS server list. argv[2] The IP address of the DNS server. argv[3] Numerical network interface number this DNS server was found on. argv[4] Numerical protocol number this DNS server was found on. (usually 2 for IPv4 and 10 for IPv6) ENVIRONMENT
AVAHI_INTERFACE Contains the textual interface name the corresponds with argv[3]. (e.g. "eth0") AVAHI_INTERFACE_DNS_SERVERS Contains a list of all DNS servers that avahi-dnsconfd found on the interface $AVAHI_INTERFACE, separated by spaces. AVAHI_DNS_SERVERS Contains a list of all DNS server that avahi-dnsconfd found on all interfaces, separated by spaces. AUTHORS
The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/ SEE ALSO
avahi-dnsconfd(8), avahi-daemon(8) COMMENTS
This man page was written using xml2man(1) by Oliver Kurth. Manuals User avahi-dnsconfd.action(8)
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